/*
 * Copyright (C) 2022  即时通讯网(52im.net) & Jack Jiang.
 * The MobileIMSDK_TCP (MobileIMSDK v6.1 TCP版) Project.
 * All rights reserved.
 *
 * > Github地址：https://github.com/JackJiang2011/MobileIMSDK
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 *
 * "即时通讯网(52im.net) - 即时通讯开发者社区!" 推荐开源工程。
 *
 * QoS4SendDaemon.java at 2022-7-16 17:22:43, code by Jack Jiang.
 */
package com.dx.mobileimsdk.client.core;

import com.dx.mobileimsdk.client.ClientCoreSDK;
import com.dx.mobileimsdk.client.utils.Log;
import net.x52im.mobileimsdk.server.protocal.Protocal;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.concurrent.ConcurrentHashMap;

public class QoS4SendDaemon {
    public final static int CHECH_INTERVAL = 5000;
    public final static int MESSAGES_JUST$NOW_TIME = 3 * 1000;
    public final static int QOS_TRY_COUNT = 2;// since 3.0 (20160918): 为了降低服务端负载，本参数由原3调整为2
    private final static String TAG = QoS4SendDaemon.class.getSimpleName();
    private static QoS4SendDaemon instance = null;
    private ConcurrentHashMap<String, Protocal> sentMessages = new ConcurrentHashMap<String, Protocal>();
    private ConcurrentHashMap<String, Long> sendMessagesTimestamp = new ConcurrentHashMap<String, Long>();
    private boolean running = false;
    private boolean _excuting = false;
    private Timer timer = null;

    private QoS4SendDaemon() {
        init();
    }

    public static QoS4SendDaemon getInstance() {
        if (instance == null) {
            synchronized (QoS4SendDaemon.class) {
                if (instance == null) {
                    instance = new QoS4SendDaemon();
                }
            }
        }
        return instance;
    }

    private void init() {
        timer = new Timer(CHECH_INTERVAL, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                run();
            }
        });
    }

    public void run() {
        if (!_excuting) {
            ArrayList<Protocal> lostMessages = new ArrayList<Protocal>();
            _excuting = true;

            try {
                if (ClientCoreSDK.DEBUG && sentMessages.size() > 0)
                    Log.d(TAG, "【IMCORE-TCP】【QoS】====== 消息发送质量保证线程运行中, 当前需要处理的列表长度为" + sentMessages.size() + "...");

                for (String key : sentMessages.keySet()) {
                    final Protocal p = sentMessages.get(key);
                    if (p != null && p.isQoS()) {
                        if (p.getRetryCount() >= QOS_TRY_COUNT) {
                            if (ClientCoreSDK.DEBUG)
                                Log.d(TAG, "【IMCORE-TCP】【QoS】指纹为" + p.getFp() + "的消息包重传次数已达" + p.getRetryCount() + "(最多" + QOS_TRY_COUNT + "次)上限，将判定为丢包！");

                            lostMessages.add((Protocal) p.clone());
                            remove(p.getFp());
                        } else {
                            //### 2015103 Bug Fix: 解决了无线网络延较大时，刚刚发出的消息在其应答包还在途中时被错误地进行重传
                            Long sendMessageTimestamp = sendMessagesTimestamp.get(key);
                            long delta = System.currentTimeMillis() - (sendMessageTimestamp == null ? 0 : sendMessageTimestamp);
                            if (delta <= MESSAGES_JUST$NOW_TIME) {
                                if (ClientCoreSDK.DEBUG)
                                    Log.w(TAG, "【IMCORE-TCP】【QoS】指纹为" + key + "的包距\"刚刚\"发出才" + delta + "ms(<=" + MESSAGES_JUST$NOW_TIME + "ms将被认定是\"刚刚\"), 本次不需要重传哦.");
                            }
                            //### 2015103 Bug Fix END
                            else {
                                new LocalDataSender.SendCommonDataAsync(p) {
                                    @Override
                                    protected void onPostExecute(Integer code) {
                                        if (code == 0) {
                                            p.increaseRetryCount();

                                            if (ClientCoreSDK.DEBUG)
                                                Log.d(TAG, "【IMCORE-TCP】【QoS】指纹为" + p.getFp() + "的消息包已成功进行重传，此次之后重传次数已达" + p.getRetryCount() + "(最多" + QOS_TRY_COUNT + "次).");
                                        } else {
                                            Log.w(TAG, "【IMCORE-TCP】【QoS】指纹为" + p.getFp() + "的消息包重传失败，它的重传次数之前已累计为" + p.getRetryCount() + "(最多" + QOS_TRY_COUNT + "次).");
                                        }
                                    }
                                }.execute();
                            }
                        }
                    } else {
                        remove(key);
                    }
                }
            } catch (Exception eee) {
                Log.w(TAG, "【IMCORE-TCP】【QoS】消息发送质量保证线程运行时发生异常," + eee.getMessage(), eee);
            }

            if (lostMessages != null && lostMessages.size() > 0)
                notifyMessageLost(lostMessages);

            _excuting = false;
        }
    }

    protected void notifyMessageLost(ArrayList<Protocal> lostMessages) {
        if (ClientCoreSDK.getInstance().getMessageQoSEvent() != null) {
            ClientCoreSDK.getInstance().getMessageQoSEvent().messagesLost(lostMessages);
        }
    }

    public void startup(boolean immediately) {
        stop();

        if (immediately)
            timer.setInitialDelay(0);
        else
            timer.setInitialDelay(CHECH_INTERVAL);
        timer.start();

        running = true;
    }

    public void stop() {
        if (timer != null)
            timer.stop();
        running = false;
    }

    public boolean isRunning() {
        return running;
    }

    boolean exist(String fingerPrint) {
        return sentMessages.get(fingerPrint) != null;
    }

    public void put(Protocal p) {
        if (p == null) {
            Log.w(TAG, "Invalid arg p==null.");
            return;
        }
        if (p.getFp() == null) {
            Log.w(TAG, "Invalid arg p.getFp() == null.");
            return;
        }

        if (!p.isQoS()) {
            Log.w(TAG, "This protocal is not QoS pkg, ignore it!");
            return;
        }

        if (sentMessages.get(p.getFp()) != null)
            Log.w(TAG, "【IMCORE-TCP】【QoS】指纹为" + p.getFp() + "的消息已经放入了发送质量保证队列，该消息为何会重复？（生成的指纹码重复？还是重复put？）");

        sentMessages.put(p.getFp(), p);
        sendMessagesTimestamp.put(p.getFp(), System.currentTimeMillis());
    }

    public void remove(final String fingerPrint) {
        sendMessagesTimestamp.remove(fingerPrint);
        Object result = sentMessages.remove(fingerPrint);

        Log.w(TAG, "【IMCORE-TCP】【QoS】指纹为" + fingerPrint + "的消息已成功从发送质量保证队列中移除(可能是收到接收方的应答也可能是达到了重传的次数上限)，重试次数=" + (result != null ? ((Protocal) result).getRetryCount() : "none呵呵."));
    }

    public void clear() {
        this.sentMessages.clear();
        this.sendMessagesTimestamp.clear();
    }

    public int size() {
        return sentMessages.size();
    }
}
